* fix warnings
* emulation on host: option -P to change FS persistence location
* exit on SIGTERM too, with SIGINT

* Adds timeout parameter to run

* Renaming varaible to connectTimeoutMs

There was a typo in I2C pin assignment, SCL was set to GPIO #4 instead of GPIO #14, The schematic can be seen here: https://github.com/OLIMEX/ESP8266/blob/master/HARDWARE/MOD-WIFI-ESP8266-DEV/MOD-WiFi-ESP8266-DEV%20revision%20B1/MOD-WiFi-ESP8266-DEV_Rev_B1.pdf

Fixes #7410

* httpclient: fix error meaning

* deprecate HTTPC_ERROR_CONNECTION_REFUSED

* EspSoftwareSerial 6.8.4: fixes parity for TX with odd data-bit count modes (e.g. 7E1)
* EspSoftwareSerial 6.8.5: examples report rx errors from HW serial API, in lieu of specific parity errors, which are not made available.

* Corrected missed edit in check_poison_block() change variable ok
to bool.

Updated time_stats (used by UMM_CRITICAL_METRICS) initializer to
include UMM_POINSON_CHECK_LITE.

Update maintenace comment block for UMM_REALLOC_...

* Add missing defined(UMM_INTEGRITY_CHECK) to heap.cpp.
Fixes build case of UMM_INTEGRITY_CHECK and Debug port: "disabled"

Add ESP8266WebServerTemplate<ServerType>::enableCORS(bool _ec) like ESP32 Arduino platform.

The certificate was regenerated yet again, so update the FP in the
SSL validation example.

Fixes #7394

emulation on host: lwIP always receive multicast packets, enable and fix multicast udp server (#7386)

ESP9266 to ESP8266

* libraries/SPI: remove pointless abs(...) call

SPI library code erroneously assumed that:
- abs() is a C function, so include stdlib.h is required.
  what happens instead is Arduino.h shadows `abs()` with it's own macro
- uint32_t() - int32_t() promotes to int32_t, thus needing abs()

Fix both issues, leaving existing calculations as-is.

* additional changes for freq and constants

- restore abs call, cast freq to correctly display the intent
- update magic numbers comments
- move some spiclk_t magic numbers to func consts

allows to effectively use virtual interfaces (ifconfig eth0:1) with a different IP address

Users aren't reporting/seeing the actual PC of failures because they
are only copying the >>stack<< into the decoder and not the Exception
line.  Add an ALL CAPS "CUT HERE FOR EXCEPTION DECODER" line to the
output to make it blindingly obvious to include the full crashdump
both in bug reports as well as exception decodes.

Fix the bad adress of the the AP if the settings are wrong

* umm_malloc manual merge with upstream

* Fix divide by zero, case when heap is 100% allocated.

* Removed extra line.

* Fixed block count for debug build. This resolves OOM events for debug build.
Correct overstepping array when freeing.

* Handle another corner case in example HeapMetric.ino.
Comment corrections.

* Revert - ESP.getMaxFreeBlockSize() is back to indicating the size of a
contiguous block of memory before the umm_malloc overhead is removed.

* Stale code cleanup and comment improvements

It seems like Macs don't have a consistent version or way of installing
Python3.  Use a prebuild binary instead of attempting to use the OS X
Python3 interpreter.

Add the ID string reported by MSYS's latest tools under Windows with
the string "MINGW..." as "Windows" for toolchain selection in get.py

(trying to compile LEAmDNS2)

* elf2bin: clean-up after objcopy, use kwargs interfaces

* unique names for segments

* names

* run with python2, just os.remove file after use

* New Graph Example

* Now using isFlashInterfacePin() no define default GPIO mask.

* Added info about zooming.

* Adressed requested changes (boolean > bool,
using esp8266::polledTimeout::periodicMs, reducing complexity)

Fixes #7323

While I'm not a fan, the Arduino FileSeek API online shows that a seek()
past EOF should return FALSE.
https://www.arduino.cc/en/Reference/FileSeek

SPIFFS and SDFS obey this, but LittleFS followed the POSIX standard or
allowing seeks past EOF.

Update LittleFS::seek() to follow the Arduino API and add tests for it.

* Clarify how to enable WiFi after DeepSleep

* Add FAQ item for recovering from DeepSleep

* Reference issue

* Update issue URL

* Remove unnecessary XMC support from eboot

eboot is always run with the flash access speed set to 20MHz, so
there is no need for special treatment of XMC chips.

* After eboot copies the new firmware into place, verify the copy.

If the data written to flash is as expected, the line cmp:0 will be displayed
after the usual @CP:0 from eboot.

* Disable interrupts during the precached part of _SPICommand()

For some reason this was an issue during the reboot after an OTA update.

Fixes #7322.  Because of UMM internals, the largest `malloc()`able block
will be smaller than the largest contiguous free RAM block.  Note in the docs.

Manually merged the PATCH files from upstream up until Jan 26, 2020.

Looks to only fix a single bug related to reading past the end of a file
in certain cases.  Other new features (secure erase) are included to
make it easier to merge any future releases, but are not enabled in the
core.

Merges included:
20fc6df0ab2bee391961b5f823a327887abc96b4
da1cf494796d68bb5c02ba70cf78a904db08a170
13935985cdde6d6b4ec77f2685264242ee55e7ac
ec68ba8208d7550860e4e78299d58a529b88bf85
f59d958e0b2f169b549e5cdc293a70bc6873cd45
f7d3e9f2b207958dfc2c01cf3fc42f98a4b9b239
554b59c147d96223ccce18374989f191f7222b45
07e013056dd976d12ae36db5c54a275e1497f6c8
d0d44c4908efff7a443ed9b1174d9173fb784a72
3cb24dbfd32a396dca46a7ca56a8e75bdcb97078
8172b40813ff36aa0df4c88a6e9c76e5300d7e32

* Flash size reduction for mime-type
* moving from fixed size strings to standard PROGMEM strings
* adding `#define MIMETYPE_MINIMAL` to reduce the footprint to
  mime-types that are strictly necessary

* Added MIMETYPE_MINIMAL conditionals

* Allow non-aligned PSTR()

* Add PSTR4() macro to first 4-bytes aligned PSTR

Co-authored-by: NAnders <andlo151@student.liu.se>